/rɪˈlæps/
the fact of becoming ill/sick again after making an improvement 旧病复发
to have/suffer a relapse
旧病复发
a risk of relapse
旧病复发的危险
verb
[I] ~ (into sth)to go back into a previous condition or into a worse state after making an improvement 退回原状；（好转后）再倒退
They relapsed into silence.他们又都沉默不语。
He relapsed into his old bad habits.他重染恶习。Two days after leaving the hospital she relapsed into a coma.出院两天后，她再度昏迷。